An airport official in Indonesia says a small plane is missing on Borneo island with an Australian and three other people on board.
Rajoki Aritonang said the Cessna aircraft was chartered by Elliott Geophysics International and failed to return from a surveying mission in Bontang. Aritonang is chief of Temindung Airport in Samarinda, the provincial capital of East Kalimantan.
The plane left Samarinda on Friday morning for a 90-minute flight to survey a coal mining site. It was carrying the pilot, two other Indonesians and the company's Australian owner.
National Search and Rescue Agency spokesman Gagah Prakoso said an eight-member team was sent to search the area where the plane lost radio contact with the airport.